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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '72862203936de5a23ab39e496a7535c6da505f47e03d48497e9be62c2632d8a1' 
  AND token = 'QW8pk72u1G2G1Ac1CXGsG0Bx4x3rrN9wryC5w8855jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}